RNA-FISH activity maps of the platypus Xs and chicken Z chromosomes.

<p>Bars represent the percentage of homogametic nuclei transcribing 2 (blue), 1 (red) or 0 (grey) alleles for each locus. Loci in pseudoautosomal regions (grey boxes) were tested in both male (indicated by a circle) and female (indicated by a star). Green coloring on platypus Xs represents homology to the chicken Z <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003635#pgen.1003635-Veyrunes1" target="_blank">[23]</a>. Platypus X chromosomes are not to scale (see <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003635#pgen.1003635.s005" target="_blank">Figure S5</a>). Genes denoted by * were analysed in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003635#pgen.1003635-Deakin1" target="_blank">[24]</a>.